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REACTION

Pronunciation (US): 

 Dictionary entry overview: What does reaction mean? 

REACTION (noun)
  The noun REACTION has 7 senses:

1. a response that reveals a person's feelings or attitude
2. a bodily process occurring due to the effect of some foregoing stimulus or agent
3. (chemistry) a process in which one or more substances are changed into others
4. an idea evoked by some experience
5. doing something in opposition to another way of doing it that you don't like
6. extreme conservatism in political or social matters
7. (mechanics) the equal and opposite force that is produced when any force is applied to a body

  Familiarity information: REACTION used as a noun is common.


 Dictionary entry details 


REACTION (noun)


Sense 1reaction [BACK TO TOP]

Meaning:

A response that reveals a person's feelings or attitude

Classified under:

Nouns denoting natural phenomena

Context examples:

he was pleased by the audience's reaction to his performance / John feared his mother's reaction when she saw the broken lamp

Hypernyms ("reaction" is a kind of...):

response (a result)


Sense 2reaction [BACK TO TOP]

Meaning:

A bodily process occurring due to the effect of some foregoing stimulus or agent

Classified under:

Nouns denoting acts or actions

Synonyms:

reaction; response

Context examples:

a bad reaction to the medicine / his responses have slowed with age

Hypernyms ("reaction" is a kind of...):

activity; bodily function; bodily process; body process (an organic process that takes place in the body)

Hyponyms (each of the following is a kind of "reaction"):

transfusion reaction (reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death)

answer (a nonverbal reaction)

passage; passing (a bodily reaction of changing from one place or stage to another)

learned reaction; learned response (a reaction that has been acquired by learning)

inborn reflex; innate reflex; instinctive reflex; physiological reaction; reflex; unconditioned reflex (an automatic instinctive unlearned reaction to a stimulus)

double take (a delayed reaction indicating surprise)

kinesis (a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation)

taxis (a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism)

automatism (any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy))

rebound (a reaction to a crisis or setback or frustration)

overreaction (an excessive reaction; a reaction with inappropriate emotional behavior)

electrical skin response; electrodermal response; Fere phenomenon; galvanic skin response; GSR; psychogalvanic response; Tarchanoff phenomenon (a change in the electrical properties of the skin in response to stress or anxiety; can be measured either by recording the electrical resistance of the skin or by recording weak currents generated by the body)

immune reaction; immune response; immunologic response (a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen)

tropism (an involuntary orienting response; positive or negative reaction to a stimulus source)


Sense 3reaction [BACK TO TOP]

Meaning:

(chemistry) a process in which one or more substances are changed into others

Classified under:

Nouns denoting natural processes

Synonyms:

chemical reaction; reaction

Context example:

there was a chemical reaction of the lime with the ground water

Hypernyms ("reaction" is a kind of...):

chemical action; chemical change; chemical process ((chemistry) any process determined by the atomic and molecular composition and structure of the substances involved)

Domain category:

chemical science; chemistry (the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions)

Hyponyms (each of the following is a kind of "reaction"):

exothermic reaction (a chemical reaction accompanied by the evolution of heat)

hydrolysis (a chemical reaction in which water reacts with a compound to produce other compounds; involves the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion from the water)

neutralisation; neutralisation reaction; neutralization; neutralization reaction (a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water)

oxidation; oxidisation; oxidization (the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction)

oxidation-reduction; oxidoreduction; redox (a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction)

photochemical reaction (a chemical reaction produced by the action of light)

reducing; reduction (any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent)

endothermic reaction (a chemical reaction accompanied by the absorption of heat)

elimination reaction (a chemical reaction in which a molecule decomposes to two different molecules)

double decomposition; double decomposition reaction; metathesis (a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB))

displacement; displacement reaction ((chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound)

chemical decomposition reaction; decomposition; decomposition reaction ((chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance)

chemical equilibrium; equilibrium (a chemical reaction and its reverse proceed at equal rates)

chain reaction (a series of chemical reactions in which the product of one is a reactant in the next)

aldol reaction (a reaction of aldehydes resulting in an aldol)

addition reaction (a chemical reaction in which one molecule is added to another)

saponification (a chemical reaction in which an ester is heated with an alkali (especially the alkaline hydrolysis of a fat or oil to make soap))


Sense 4reaction [BACK TO TOP]

Meaning:

An idea evoked by some experience

Classified under:

Nouns denoting cognitive processes and contents

Context example:

his reaction to the news was to start planning what to do

Hypernyms ("reaction" is a kind of...):

idea; thought (the content of cognition; the main thing you are thinking about)


Sense 5reaction [BACK TO TOP]

Meaning:

Doing something in opposition to another way of doing it that you don't like

Classified under:

Nouns denoting acts or actions

Context example:

his style of painting was a reaction against cubism

Hypernyms ("reaction" is a kind of...):

opposition; resistance (the action of opposing something that you disapprove or disagree with)

Hyponyms (each of the following is a kind of "reaction"):

backlash (an adverse reaction to some political or social occurrence)


Sense 6reaction [BACK TO TOP]

Meaning:

Extreme conservatism in political or social matters

Classified under:

Nouns denoting cognitive processes and contents

Context example:

the forces of reaction carried the election

Hypernyms ("reaction" is a kind of...):

conservatism; conservativism (a political or theological orientation advocating the preservation of the best in society and opposing radical changes)


Sense 7reaction [BACK TO TOP]

Meaning:

(mechanics) the equal and opposite force that is produced when any force is applied to a body

Classified under:

Nouns denoting natural phenomena

Context example:

every action has an equal and opposite reaction

Hypernyms ("reaction" is a kind of...):

force ((physics) the influence that produces a change in a physical quantity)

Domain category:

mechanics (the branch of physics concerned with the motion of bodies in a frame of reference)


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